Central American migrants climb on a north bound train during their journey toward the U.S.-Mexico border, in Ixtepec, Mexico, Saturday, July 12, 2014. The number of unaccompanied minors detained on the U.S. border has more than tripled since 2011. Children are also widely believed to be crossing with their parents in rising numbers.

Photo: Eduardo Verdugo, Associated Press

Central American migrants climb on a north bound train during their...

Central American migrants climb on a north bound train during their... Photo-6594830.89670 - SFGate

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Kashmiri protesters shout slogans against Israel from inside a police vehicle after they were detained during a protest in Srinagar, India, Monday, July 14, 2014. The protest was against the Israeli military operation in Gaza strip. Palestinian militants in the Gaza Strip launched an unmanned drone aircraft at Israel on Monday and Israeli air attacks killed four Gaza residents, as the conflict between the antagonists closed out its first week with no end in sight. The placard reads: "Killer of Humanity, Stop Killings in Palestine." (AP Photo/Mukhtar Khan)

Mysean Walls, 3, of Sacramento cools himself down with a garden hose in his yard near Broadway and Muir Way as the temperature rises above 100 degrees on Monday, July 14, 2014 in Sacramento, Calif. (AP Photo/The Sacramento Bee, Randy Pench) MAGS OUT; LOCAL TELEVISION OUT (KCRA3, KXTV10, KOVR13, KUVS19, KMAZ31, KTXL40); MANDATORY CREDIT

Photo: Randy Pench, Associated Press

Mysean Walls, 3, of Sacramento cools himself down with a garden...

Mysean Walls, 3, of Sacramento cools himself down with a garden... Photo-6596457.89670 - SFGate

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A mother walks with her child in the Xingtian Temple in Taipei, Taiwan, Monday, July 14, 2014. (AP Photo/Wally Santana)

Photo: Wally Santana, Associated Press

A mother walks with her child in the Xingtian Temple in Taipei,...

A mother walks with her child in the Xingtian Temple in Taipei,... Photo-6596459.89670 - SFGate

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Zach Butterfield, 9, drifts along on the lazy river at the Memphis Jewish Community Center water park Monday, July 14, 2014. (Jim Weber/The Commercial Appeal)

Photo: Jim Weber, Associated Press

Zach Butterfield, 9, drifts along on the lazy river at the Memphis...

Zach Butterfield, 9, drifts along on the lazy river at the Memphis... Photo-6596460.89670 - SFGate

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Germany's Bastian Schweinsteiger, left, plays basketball with kids as Lukas Podolski, wearing Brazil's Flamengo soccer jersey, walks behind at the Sheraton Hotel, one day after Germany won the World Cup in Rio de Janeiro, Brazil, Monday, July 14, 2014. (AP Photo)

In this photo taken on a smartphone on Saturday, July 12, 2014, people run to shelter from hailstorm on the beach at Ob River, the major river in western Siberia in Novosibirsk, Russia. The Investigative Committee said in a statement published online Monday that two young girls aged three and four had died Saturday in the lakeside town of Bredsk, not far from the large Siberian city of Novosibirsk. The two girls died after sustaining traumatic brain injuries when a tree fell on their tent, where they were taking shelter from the storm along with their families. (AP Photo/Nikita Dudnik)

Photo: Nikita Dudnik, Associated Press

In this photo taken on a smartphone on Saturday, July 12, 2014,...

In this photo taken on a smartphone on Saturday, July 12, 2014,... Photo-6596465.89670 - SFGate

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*** BESTPIX ***

Photo: Dan Kitwood, Getty Images

*** BESTPIX ***

*** BESTPIX *** Photo-6596466.89670 - SFGate

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Colombian bullfighter Luis Bolivar is tossed by a Miura ranch fighting bull after he nailed a sword in the back of the bull, during a bullfight of the San Fermin festival in Pamplona, Spain, Monday, July 14, 2014. Revelers from around the world arrive to Pamplona every year to take part in some of the eight days of the running of the bulls. (AP Photo/Andres Kudacki)

A Palestinian mourner cries in a house after the bodies of Mousa Abu Muamer, 56, and his son Saddam, 27, who were killed in an overnight Israeli missile strike at their house in the outskirts of the town of Khan Younis, southern Gaza Strip, were brought in for their funeral, Monday, July 14, 2014. Saddam's wife, Hanadi, 27, was also killed in the attack. (AP Photo/Lefteris Pitarakis)

Photo: Lefteris Pitarakis, Associated Press

A Palestinian mourner cries in a house after the bodies of Mousa...

A Palestinian mourner cries in a house after the bodies of Mousa... Photo-6596476.89670 - SFGate

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Bastille Day fireworks explode over the Seine river next to the Eiffel Tower in Paris Monday night, July 14, 2014. Bastille Day commemorates the storming by Parisians of the Bastille prison on July 14, 1789, setting off the French Revolution that toppled King Louis XVI and put an end to monarchy.(AP Photo/Jacques Brinon)

Photo: Jacques Brinon, Associated Press

Bastille Day fireworks explode over the Seine river next to the...

Bastille Day fireworks explode over the Seine river next to the... Photo-6596477.89670 - SFGate

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An Afghan boy reads the Quran during the Muslim holy month of Ramadan at a mosque in Kandahar, Afghanistan, Monday, July 14, 2014. For believers, Ramadan is meant to be a time of reflection and worship, remembering the hardships of others and being charitable. (AP Photo/Allauddin Khan)

Dottie Goeller finds a pair of dry and clean boots to wear while wading through mud on the floor of the house where she is living in Green Mountain Falls, Colo., on Monday, July 14, 2014. Last year, the same home was flooded during the summer rains. (AP Photo/The Colorado Springs Gazette, Jerilee Bennett) MAGS OUT

Two men take in a scenic overlook off Trail Ridge Road, above tree-line at Rocky Mountain National Park, west of Estes Park, Colo., Monday, July 14, 2014. Lightning killed two people last weekend just miles apart in the popular park, where summer storms can close in quickly with deadly results. (AP Photo/Brennan Linsley)

Photo: Breannan Linsley, Associated Press

Two men take in a scenic overlook off Trail Ridge Road, above...

Two men take in a scenic overlook off Trail Ridge Road, above... Photo-6596490.89670 - SFGate

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A Dragonfly sits on pond grass while at Glenmere Park in Greeley, Colo., Monday, July, 14, 2014. Dragonflies are major predators that eat mosquitoes, and other small insects like flies, bees, ants, wasps, and very rarely butterflies. About 5,900 types of Dragonflies are known. A big cool off is expected to begin on Wednesday along with thunder storms to hit Northern Colorado. ( AP Photo/The Greeley Tribune, Jim Rydbom)

Photo: Jim Rydbom, Associated Press

A Dragonfly sits on pond grass while at Glenmere Park in Greeley,...

A Dragonfly sits on pond grass while at Glenmere Park in Greeley,... Photo-6596471.89670 - SFGate

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Two-year-old Asher Potts enjoys the grand opening Monday, July 14, 2014, of Through the Roof Therapy with special instructor Whitney Russell. The non-profit organization provides physical, occupational, speech therapies and special instruction to special needs children free of charge and is located in Hernando, Miss. (AP Photo/The Commercial Appeal, Stan Carroll)

Pedestrians stand near a memorial to Lawrence Campbell, who allegedly shot and killed 23-year-old Jersey City police officer Melvin Santiago, Monday, July 14, 2014, in Jersey City, N.J. Campbell was also killed at the scene after police officers returned fire. (AP Photo/John Minchillo)

Betty Mowery of Winchester, Va. holds one of the three baby squirrels she discovered among the marigolds growing in her backyard planter Monday, July 14, 2014. Mowery said it appears the mother is feeding them but she worries that a cat may get them. (AP Photo/The Winchester Star, Jeff Taylor)

Photo: Jeff Taylor, Associated Press

Betty Mowery of Winchester, Va. holds one of the three baby...

Betty Mowery of Winchester, Va. holds one of the three baby... Photo-6594441.89670 - SFGate

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Storm clouds can be seen near a pond Monday, July 14, 2014, near Stewarts Lane in Boyle County near Danville, Ky. (AP Photo/The Advocate-Messenger, Clay Jackson)

Photo: Clay Jackson, Associated Press

Storm clouds can be seen near a pond Monday, July 14, 2014, near...

Storm clouds can be seen near a pond Monday, July 14, 2014, near... Photo-6596468.89670 - SFGate

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An excavator takes down the old Hollywood Bar on Golden State Boulevard in Fresno, early Monday, July 14, 2014, to make way for high-speed rail, as one of the first components of demolition for the project. (AP Photo/The Fresno Bee, John Walker)

Photo: John Walker, Associated Press

An excavator takes down the old Hollywood Bar on Golden State...

An excavator takes down the old Hollywood Bar on Golden State... Photo-6596495.89670 - SFGate